Pump



R. T. sMooT Feb. 11,1941.

PUMP

2 Sheets-Sheet 1 Filed March 50, 1940 Invenlor A llorney Feb.11,1941. R1 T' 2,231,820

PUMP

Filed March 30, 1940 2 Sheets-Sheet 2 Inventor A llomeg;

Patented Feb. 11, 1 941 UNITED STATES PATENT OFFICE 2 Claims.

This invention relates to improvements in pumps, the general object of the invention being to provide the cylinder of the pump with an additional piston so that when one piston wears and 6 fails to produce enough suction to lift the water or other fluid from a well then the piston rod can e readily connected with a second piston so that the pump will begin to operate again without requiring the parts being pulled from the well.

10 This invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in 15 the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:

20 Figure 1 is a vertical sectional view through a pump cylinder with the double piston arrangement therein in accordance with this invention.

Figure 2 is a bottom plan view of the lower or supplemental piston.

25 Figure 3 is a transverse sectional view through the cylinder and showing the bottom thereof.

Figure 4 is a vertical sectional View with parts in elevation and showing the supplemental or lower piston connected with the upper piston after 30 the upper piston has become worn.

Figure 5 is a View of the short tubular member which connects the upper piston with the lower piston.

Figure 6 is a section on the line 6--% of Figure In these drawings the numeral l indicates the cylinder of the pump which is provided with the end caps 2 and 3, a pipe 4 being connected with the lower cap 3 and extending into the bottom of 40 the well while an outlet pipe 5 is connected with the top cap 2 and leads to the pump at the top of the well. The upper piston is shown at 6 and is of the ordinary or any suitable construction and has the spider l threaded to its top part to 45 which the piston rod 8 is threaded. The valve is shown at 9 and opens upwardly and is of conical shape and controls the passage through the piston. In carrying out my invention I provide a short pipe I I which is threaded into a countersink 50 at the lower end of the bore or passage I0 and the lower end of this pipe is threaded as at l2 and has a short vertical groove I3 in the lower threaded part to receive a small leaf spring [4, see Figures 1 and 5. I also provide a second piston I6 which 5 is of substantially the same construction as the piston 6 except that it is formed with the lugs IT on its bottom part, see Figure 2, for fitting in the raised socket-forming parts l8 on the upper face of the under cap 3 as shown in Figures 1 and 3. These lugs l'lprevent the piston I6 from turning 5 when the piston is resting on the bottom cap and they also hold the piston in raised position so as to not interfere with the upward movement of the valve l9 at the top of the pipe 4 and said piston It has the passage 20 passing therethrough which is controlled by the valve 2|. A sleeve 22 is threaded to a tubular boss 23 at. the top of the piston I6 and which forms a cage for the valve 2| and said sleeve has a flaring upper end 24 and a threaded cylindrical part 25 under the flaring part. When the piston 6 is in proper condition it is used to draw the water from the bottom of the well into the cylinder on its up-stroke and then on its down-stroke the water is forced through the piston into the pipe 5 in the usual manner. The lower piston I6 remains idle at the bottom of the cylinder and, of course, the water or other fluid passes through the same as the valves l9 and 2| open and then these valves close to prevent the back flow of water or fluid from the cylinder. The

spring l4 prevents entrance of the pipe H into the sleeve 22 if the stroke of the pump rod 8 should be too great but when it is desired to use the second piston on account of leakage of the packing means of the upper piston 6 the rod 8 is dropped or moved downwardly until the lower end of the pipe II enters the flaring part 24 of the sleeve 22 and pressure may be applied to the rod so as to cause the spring M to move into the recess l3 under said spring. .The the rod 8 is turned so as to turn the upper piston and the pipe I l to cause the threaded part l2 of the pipe II to engage the threaded part 25 of the sleeve 22 which, of course, connects the lower piston with the upper piston and, therefore, with the rod 8. Then as the pump is moved the lower piston moves with the upper piston and therefore produces the pumping action.

Thus it will be seen that after the upper piston becomes defective which would ordinarily mean 5 the pulling of the pump to rep-ack or replace the piston, it is simply nfeoessary to connect the upper piston with the lower piston so as to bring the lower piston into use and then the pumping operation can be continued without pulling the pump. Any number of springs I4 can be used, as required.

It is thought from the foregoing description that the advantages and novel features of the invention will be readilyapparent.

in the construction and in the combination and arrangement of the several parts provided that such changes fall within the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. In a pump, a cylinder, a piston therein having a passage therethrough, a piston rod connected with the upper end of the piston, a valve for controlling the passage, a lower piston in the cylinder having a passage therethrough, a valve controlling the passage, lugs depending from the lower end of the lower piston, socket forming members extending upwardly from the lower end of the cylinder, for receiving the lugs for preventing movement of the lower piston and for holding the lower piston in raised position in the cylinder, and means for connecting the upper piston with the lower piston when the upper piston becomes defective, said means including a tubular member depending from the upper piston and having a threaded lower end, a sleeve connected with the top of the lower piston and having a flared upper end and a threaded part below said upper end for receiving the threaded part of the tubular member when the piston rod is moved downwardly.

2. In a pump, a cylinder, a piston therein having a passage therethrough, a piston rod connected with the upper end of the piston, a valve for controlling the passage, a lower piston in the cylinder having a passage therethrough, a valve controlling the passage, means at the lower end of the lower piston and at the lower end of the cylinder for preventing movement of the lower piston and for holding the lower piston in raised position in the cylinder, and means for connecting the upper piston with the lower piston when the upper piston becomes defective, said means including a tubular member depending from the upper piston and having a threaded lower end, a sleeve connected with the top of the lower piston and having a flared upper end and a threaded part below said upper end for receiving the threaded part of the tubular member when the piston rod is moved downwardly, said lower end of the tubular member having a vertical groove therein, a spring having one end fastened in the lower part of the groove and normally projecting from the groove, said spring being pressed into the groove when the tubular member is forced into the sleeve.

ROY T. SMOOT. 

